2013-10-06_PERMIT FILE - C1981019

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RULE 2 PERMITS shows the initial box cut of the Collom Lite Pit, which creates the majority of the material ultimately to be stored in the Temporary Spoil Pile. Backfilling of northern portions of the Little Collom X pit will be carried out in 2016 and 2017 as shown on Map 29B. Also shown on Map 29B, and as mentioned above, backfilling the portion of the Little Collom X pit beneath the toe of the spoil pile will necessarily be delayed until 2033 when the spoil pile has been removed from that area. Coal production from the Little Collom X pit will take place in 2012 and continue through 2015. A total overburden/interburden volume of 43,636,000 bank cubic yards (bcy) and coal tonnage of 2,552,000 tons estimated to be generated and produced, respectively, from the Little Collom X pit. For development of the Little Collom X and Collom Lite pits, Colowyo will utilize only truck/shovel techniques. Mining will be conducted in an up -dip direction (north to south) using conventional truck/shovel mining techniques. A swell factor of 15% will be applied to overburden material in the Collom expansion area as the truck/shovel fleet will be moving this material. Please refer to Table 2.05.6-5 for specific volumetric information on overburden and coal including swell factor effects. Please refer to Volume 1, Section 2.05.3 for blasting procedures and sequencing information applicable to the Collom expansion area activities. Please also refer to Section 4.08 of this package for additional information. Once the overburden is sufficiently fragmented to allow for efficient removal and loading, overburden will be loaded and transported to the temporary out -of -pit spoil stockpile or to the adjoining mined -out pit. After removal of the overburden, the coal seams will be exposed. As the coal seams are exposed, they will be cleaned using auxiliary equipment, then either drilled and shot with explosives, or ripped to prepare the coal for loading and removal. When explosives are needed, the drilling will be performed by an auger drill. The drill hole pattern is generally spaced approximately 12 feet by 12 feet, though dependent upon the actual coal seam thickness. Drill holes will be loaded with either ANFO or a waterproof explosive (if the holes are wet), to a typical powder factor of about 0.2 pounds per ton. Once the coal has been prepared for loading by blasting or ripping, a rubber -tired front-end loader or excavator will load the coal into haulage trucks. Following loading, these haulage trucks will transport the coal along in pit haulage routes to the primary crusher located just outside of the pit, as shown on Map 25D (Collom Haul Roads). Coal from the primary crusher will be loaded into trucks and transported on a paved haulage road (See Map 25E — Collom Haul Road, Sheets 1-10) to the coal crushing and load -out facility at the Colowyo permit area as shown on the Structures and Facilities Map (Volume 8, Map 22). Details of the coal crushing and load -out facilities are included in Volume 1, Section 2.05.3 under the heading of Mine Facilities. As the temporary overburden stockpiles are constructed, best management practices to reduce sediment production and impacts to adjoining areas will be implemented. Interim reclamation of temporary spoil stockpiles will be performed to reduce resource impacts, if determined to be necessary. As soon as possible after the coal is removed from the mining area and sufficient room is available for back -filling, reclamation begins. In general, rough backfilling is completed by the overburden trucks and bulldozers. Final grading will be performed to recreate a post mining topographic expression that is similar to the pre -mining topography. Moderation of some existing topographical expressions is Collom— Rule 2, Page 93 Revision Date: 6/15/15 Revision No.: TR -106